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Multi-channel data transmission through a multimode fiber based on OAM phase encoding.

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    This study introduces phase encoding for orbital angular momentum (OAM) data transmission, outperforming amplitude encoding in scattering environments. The new method achieves high accuracy and stability, enabling efficient high-speed data transfer.

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    Area of Science:

    • Optics and Photonics
    • Information and Communication Technology
    • Signal Processing

    Background:

    • Orbital Angular Momentum (OAM) multiplexing enables high-capacity data transmission.
    • Amplitude encoding of OAM modes suffers from crosstalk and high bit error rates under scattering conditions.
    • Existing methods require extensive output mode measurement, limiting practical applications.

    Purpose of the Study:

    • To propose and experimentally validate a novel multi-channel data transmission method using OAM phase modulation.
    • To overcome the limitations of amplitude encoding in scattering media, specifically crosstalk and bit error rates.
    • To demonstrate high-speed, accurate data transmission with minimal output mode measurement.

    Main Methods:

    • Developed a data transmission technique based on Orbital Angular Momentum (OAM) phase modulation (phase encoding).
    • Investigated the method's performance under multiple scattering effects in multimode fibers.
    • Utilized minimal camera pixels for output mode measurement to assess accuracy and efficiency.

    Main Results:

    • Achieved a bit error rate below 0.005% for color image transmission through 60m of multimode fiber.
    • Demonstrated accurate data transmission using only two rows of camera pixels for output mode measurement.
    • Showcased superior stability compared to amplitude encoding, especially with varying data patterns.

    Conclusions:

    • OAM phase encoding offers a robust and accurate solution for high-speed data transmission in scattering environments.
    • The proposed method significantly reduces crosstalk and bit error rates compared to amplitude encoding.
    • Minimal output mode measurement requirements make this technique suitable for practical, high-speed communication systems.